IEEE C57.12.51 2009
$37.38
IEEE Standard for Ventilated Dry- Type Power Transformers, 501 kVA and Larger, Three-Phase, with High- Voltage 601 V to 34 500 V; Low- Voltage 208Y/120 V to 4160 V- General Requirements
| Published By | Publication Date | Number of Pages |
| IEEE | 2009 | 29 |
New IEEE Standard – Active. This standard is intended to set forth characteristics relating to performance, limited electrical and mechanical interchangeability, and safety of the equipment described, and to assist in the proper selection of such equipment. Specific rating combinations are described in the range from 750/1000 to 7500/10 000 kVA inclusive, with high-voltage 601 to 34 500 volts inclusive and low-voltage 208Y/120 to 4160 volts inclusive. Part I of this standard describes certain electrical and mechanical requirements and takes into consideration certain safety features of 60-Hz, two-winding, three-phase, ventilated dry-type transformers with self-cooled ratings 501 kVA and larger, generally used for step-down purposes. Part Il describes other requirements or alternatives which may be specified for some applications and lists forced-air-cooled ratings for certain sizes.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 1 | IEEE Std C57.12.51-2008 Front Cover |
| 3 | Title Page |
| 4 | Abstract/Keywords |
| 6 | Introduction Notice to users Laws and regulations Copyrights Updating of IEEE documents |
| 7 | Errata Interpretations Patents |
| 8 | Participants |
| 9 | Contents |
| 11 | Important Notice 1. Overview 1.1 Scope 1.2 Purpose |
| 12 | 2. Normative references 3. Definitions 4. Usual service conditions 5. Ratings and characteristics 5.1 Kilovolt-ampere ratings |
| 13 | 5.2 Kilovolt-ampere and voltage ratings 5.3 Taps 5.4 Insulation levels |
| 14 | 5.5 Angular displacement and terminal markings |
| 15 | 5.6 Percent impedance voltage 6. Construction 6.1 Insulation system 6.2 Accessory location |
| 16 | 6.3 Nameplate 6.4 Transformer connections |
| 17 | 6.5 Tap changing 6.6 Lifting, jacking, and moving facilities |
| 18 | 6.7 Ground pad |
| 19 | 6.8 Transformer enclosure |
| 20 | 7. Routine tests 8. Tolerances 9. Other ratings and characteristics 9.1 Forced-air-cooled ratings |
| 21 | 9.2 40 Ā°C average ambient temperature conditions 9.3 Other winding temperature rises 9.4 Other temperature class insulation systems |
| 22 | 9.5 Other high-voltage ratings and connections |
| 23 | 9.6 YāY connected transformers |
| 25 | 9.7 Increased neutral insulation 9.8 Other basic lightning impulse insulation levels |
| 26 | 10. Other construction 10.1 High-voltage connection arrangements 10.2 Low-voltage connection arrangements 10.3 Surge arresters |
| 27 | 10.4 Unit substation application 10.5 Temperature devices 10.6 Forced-air cooling 10.7 Provision for future forced-air cooling |
| 28 | 10.8 Space heaters 10.9 Current transformers (or provision for their addition in the future) 10.10 Terminal blocks 10.11 Contacts 11. Other tests |
| 29 | Annex A (informative) Bibliography |
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